In a large bowl, beat the cream cheese, sour cream and salad dressing mix until blended. Fold in the broccoli and 1-1/2 cups of cheese.
Spoon into a shallow 1-qt. baking dish coated with cooking spray. Bake, uncovered, at 350° for 20 minutes. Sprinkle with remaining cheese. Bake 5 minutes longer or until cheese is melted. Serve warm with crackers. Yield: 3-1/2 cups.